A wear-resistant and wave-transparent drill pipe for logging while drilling and a preparation method thereof

Abstract

The application provides a wear-resistant and wave-transparent drill pipe for logging while drilling and a preparation method thereof, and the method comprises three steps of preparing a high-strength wave-transparent composite pipe, preparing a wear-resistant insulating coating and installing a metal connecting head; the wear-resistant and wave-transparent drill pipe comprises the high-strength wave-transparent composite pipe, one metal connecting head is fixedly installed at each axial end of the high-strength wave-transparent composite pipe, and the outer surface of the high-strength wave-transparent composite pipe is coated with the wear-resistant insulating coating. Through the specific preparation process, the tensile and torsional mechanical properties of the high-strength wave-transparent composite pipe are improved; through selecting high-modulus and low-dielectric-constant fibers as main raw materials, the drill pipe can allow electromagnetic wave signals to penetrate the drill pipe, logging instruments such as geological radars and transient electromagnetic devices are assembled in the drill pipe, the shielding problem of electromagnetic waves by the traditional metal drill pipe is solved, and the application requirement of logging while drilling is met; and the good wave-transparency of the drill pipe wave-transparent pipe body improves the detection precision.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mine, geology and oil exploration, and relates to a drill pipe for drilling, in particular to a wear-resistant and wave-transparent drill pipe for logging while drilling and a preparation method thereof. BACKGROUND

[0002] Drilling and geophysical exploration are integrated, and logging is completed simultaneously in the process of drilling, so that transparent geology can be constructed more quickly and accurately. The principle of borehole geophysical logging technology is that all or part of the working modules such as a transmitting source, a transmitting and receiving antenna system and a receiving and collecting system are placed in a borehole, electromagnetic wave signals of different frequencies are transmitted to the surrounding formation, and finally the information about the target object or geological structure around the borehole is obtained by imaging or inverting the information such as amplitude, time and phase carried by the received signals.

[0003] At present, the drill pipe and the outer tube of the logging-while-drilling trajectory measuring instrument used in drilling are mostly made of metal materials such as alloy steel, beryllium copper, non-magnetic steel, titanium alloy and aluminum alloy. However, the electromagnetic induction secondary field of the logging instrument cannot pass through the metal pipe wall to enter the formation or return to the drill pipe from the formation, and the non-transparency of the drill pipe causes signal interruption. The strength and wear-resistant life of the conventional non-metal wave-transparent drill pipe cannot meet the requirements of logging while drilling, and the logging instrument can only be pushed into the borehole after well completion, which prolongs the construction period. In addition, in directional drilling, it is difficult to accurately push the instrument to the bottom of the borehole due to the bending of the borehole and the multiple branch holes, which may cause instrument loss due to fracture.

[0004] As known from the above, in order to complete the drilling and logging simultaneously in one drilling, the logging instrument must be placed in the wear-resistant and wave-transparent drill pipe during directional drilling. However, the existing logging-while-drilling measuring metal pipe has signal shielding obstacles for the logging instrument, and the wave-transparent pipe pushed secondarily has insufficient strength, short surface wear-resistant life, complex construction process and difficulty in fully detecting long directional holes. SUMMARY

[0005] In view of the defects and deficiencies in the prior art, the present application aims to provide a wear-resistant and wave-transparent drill pipe for logging while drilling and a preparation method thereof, so as to solve the technical problems that the logging-while-drilling measuring metal pipe has signal shielding obstacles for the logging instrument, the wave-transparent pipe pushed secondarily has insufficient strength, short surface wear-resistant life, complex construction process and difficulty in fully detecting long directional holes.

[0006] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0007] A preparation method of a wear-resistant and wave-transparent drill pipe for logging while drilling, which specifically comprises the following steps:

[0008] Step 1: preparing a high-strength wave-transparent composite pipe

[0009] Step 1.1, high-strength wave-transparent pipe is prepared by using fiber winding process; or high-strength wave-transparent pipe is prepared by using fiber weaving-winding process; or high-strength wave-transparent pipe is prepared by using twice fiber weaving-winding process; in addition, pipe winding forming, vacuum bag forming, mold pressing forming and pultrusion forming processes can also be used; the weaving structure uses one of three-dimensional four-direction, three-dimensional five-direction and three-dimensional six-direction weaving structures.

[0010] Step 1.2, the high-strength wave-transparent pipe prepared in step 1.1 is cured and formed, and after demolding, a high-strength wave-transparent composite pipe is prepared.

[0011] Step two, wear-resistant insulating coating is prepared by using high-pressure cold spraying process; or wear-resistant insulating coating is prepared by using winding coating process; or wear-resistant insulating coating is prepared by using normal pressure coating process.

[0012] Step three, metal connecting head is installed:

[0013] Pre-tightening force is applied, and the metal connecting head is installed at the axial both ends of the high-strength wave-transparent composite pipe with wear-resistant insulating coating on the surface, the composite pipe and the metal joint interface are coated with structural adhesive, and the composite pipe and the metal joint are in interference fit in the radial direction, and after installation is completed, a wear-resistant wave-transparent drill pipe for logging while drilling is prepared.

[0014] The application also has the following technical features:

[0015] Specifically, the three ways of step 1.1 are as follows:

[0016] Step 1.1.1, high-strength wave-transparent pipe is prepared by using fiber winding-laying process:

[0017] The high-strength wave-transparent fiber tube yarn is installed on the rotating movable support, a group of high-strength wave-transparent fiber filaments are drawn out from the high-strength wave-transparent fiber tube yarn, and under the traction of the traction equipment, the high-strength wave-transparent pipe is prepared by winding along the mandrel with a certain laying angle after passing through the tension three-roller, the groove box filled with resin and the extrusion roller in sequence.

[0018] Step 1.1.2, high-strength wave-transparent pipe is prepared by using fiber weaving-winding process:

[0019] The high-strength wave-transparent fiber is woven into twill high-strength wave-transparent fiber cloth by using three-dimensional five-direction weaving structure, and then the twill high-strength wave-transparent fiber cloth is wound on the mandrel after pipe winding forming and resin curing; the woven twill high-strength wave-transparent fiber cloth is wound on the mandrel to prepare the high-strength wave-transparent pipe.

[0020] Step 1.1.3, high-strength wave-transparent pipe is prepared by using twice fiber weaving-winding process:

[0021] The high-strength and wave-transparent fiber is woven into high-strength and wave-transparent fiber cloth by using three-dimensional six-directional weaving structure, and the high-strength and wave-transparent fiber cloth is formed into high-strength and wave-transparent fiber cloth tube yarn after coiling and molding and then resin curing; the high-strength and wave-transparent fiber cloth tube yarn is installed on a rotating movable support, a group of high-strength and wave-transparent fiber filaments are drawn from the high-strength and wave-transparent fiber cloth tube yarn, and the high-strength and wave-transparent fiber filaments pass through a tension three-roller, a groove box filled with resin and an extrusion roller in sequence under the traction of a traction device; then the high-strength and wave-transparent pipe fittings are prepared by winding on a core mold in a certain winding angle by using two-dimensional twill weaving structure.

[0022] Specifically, the three ways of step two are as follows:

[0023] Step 2.1, a wear-resistant and insulating coating is prepared by using high-pressure cold spraying process:

[0024] After ball milling of the wear-resistant and insulating coating raw material particles, nano wear-resistant and insulating coating raw material powder is obtained; the gas is simultaneously introduced into the solid particle fluidization conveyor and the atomizer of the spray deposition equipment, so that the nano wear-resistant and insulating coating raw material powder is atomized and deposited on the outer surface of the circumferentially rotating high-strength and wave-transparent composite pipe, and the high-strength and wave-transparent composite pipe with a wear-resistant and insulating coating on the surface is prepared.

[0025] Step 2.2, a wear-resistant and insulating coating is prepared by using winding and coating process:

[0026] The wear-resistant and insulating coating raw material is placed in the groove box, and the fibers on the outer layer of the high-strength and wave-transparent composite pipe pass through a tension three-roller, a groove box filled with wear-resistant and insulating coating raw material and an extrusion roller in sequence under the traction of a traction device, so that the wear-resistant and insulating coating raw material is wound on the surface of the high-strength and wave-transparent composite pipe, and the high-strength and wave-transparent composite pipe with a wear-resistant and insulating coating on the surface is prepared.

[0027] Step 2.3, a wear-resistant and insulating coating is prepared by using normal pressure coating process:

[0028] The wear-resistant and insulating coating raw material particles and the resin are mixed in the groove box, a diluent is added and stirred uniformly, and the mixed colloid is uniformly applied on the surface of the high-strength and wave-transparent composite pipe in a certain direction by using a brushing tool, and the high-strength and wave-transparent composite pipe with a wear-resistant and insulating coating on the surface is prepared.

[0029] Preferably, in step 1.1.2, the high-strength and wave-transparent fiber is quartz fiber; most preferably, the quartz fiber is low dielectric constant quartz fiber roving, and the diameter is 5-20 μm; and the resin is epoxy resin.

[0030] Preferably, in step 1.1.3, the high-strength and wave-transparent fiber is poly-p-phenylene benzobisoxazole fiber; and the resin is epoxy resin.

[0031] Preferably, in step 1.2, the heating temperature used in the solidification forming is 60-100℃.

[0032] Preferably, in step 2.1, the ball milling is performed at a speed of 200-250 rpm for 3-4 h.

[0033] Preferably, in step 2.1, the gas is nitrogen at a pressure of 0.5-1 MPa.

[0034] Preferably, in step 2.1, the rotation speed of the high-strength wave-transparent composite pipe is 2-4 mm / s.

[0035] Preferably, in step 2.1, the wear-resistant insulating coating raw material is silicon carbide.

[0036] Preferably, in step 2.2, the wear-resistant insulating coating raw material is diamond micro-powder particles or polytetrafluoroethylene.

[0037] Preferably, in step three, the pre-tightening force is not less than 30,000 N.

[0038] The application also protects a wear-resistant wave-transparent drill pipe for logging while drilling prepared by the above preparation method, which comprises a high-strength wave-transparent composite pipe; the axial both ends of the high-strength wave-transparent composite pipe are open, and a metal connector is fixedly installed at each of the axial both ends of the high-strength wave-transparent composite pipe; the inner cavity of the high-strength wave-transparent composite pipe is used for setting a logging while drilling instrument; and the outer surface of the high-strength wave-transparent composite pipe is coated with a wear-resistant insulating coating.

[0039] Specifically, the high-strength wave-transparent composite pipe is prepared from high-strength wave-transparent fibers and resin.

[0040] Specifically, the high-strength wave-transparent fibers are prepared from one or more continuous fiber materials selected from the group consisting of glass fibers, basalt fibers, quartz fibers, ceramic fibers, aramid fibers and poly-p-phenylene benzobisoxazole fibers; preferably, the high-strength wave-transparent material is glass fibers, quartz fibers or poly-p-phenylene benzobisoxazole fibers.

[0041] Specifically, the resin is selected from one or more combinations of epoxy resin, cyanate ester resin, phenolic resin, polyurethane resin and acrylic resin; preferably, the resin is polyurethane resin or epoxy resin.

[0042] Specifically, the metal connector is prepared from alloy steel or non-magnetic steel; preferably, the metal connector is prepared from 42CrMo steel or 42Cr steel.

[0043] Specifically, the wear-resistant insulating coating is made of one or more of diamond, aluminum oxide, silicon carbide, polycarbosilane and polytetrafluoroethylene; preferably, the wear-resistant insulating coating is made of silicon carbide, diamond or polytetrafluoroethylene.

[0044] Specifically, the wear-resistant insulating coating has a thickness of 0.5-1 mm.

[0045] Specifically, the wear-resistant and wave-transparent drill rod for logging while drilling has an outer diameter of 70-100 mm and a wall thickness of 12-20 mm.

[0046] Specifically, the metal connector comprises a metal connector main body, and a cavity in the metal connector main body comprises a metal connector drill installation cavity, a logging instrument setting cavity and a high-strength wave-transparent composite pipe connecting cavity in sequence; a metal connector internal thread is arranged on the inner wall of the metal connector drill installation cavity, and the metal connector internal thread is used for connecting the drill pipe with other drilling tools; a logging instrument fixing thread is arranged on the inner wall of the logging instrument setting cavity.

[0047] Specifically, the metal connector and the high-strength wave-transparent composite pipe are connected by one or more of bonding, clamping, pin riveting and the like; preferably, the metal connector and the high-strength wave-transparent composite pipe are connected by bonding and rivet combination.

[0048] Specifically, the metal connector has a length of 150-200 mm.

[0049] Specifically and preferably, the high-strength wave-transparent composite pipe is coated with structural glue at the metal contact surface, a plurality of rivet positioning holes are arranged on the metal connector main body outside the composite pipe connecting cavity, the rivet positioning holes are evenly arranged along the circumferential direction, and the rivet positioning holes are used for installing load transmission rivets.

[0050] Specifically, the metal connector is connected with the drill pipe or other drilling tools by screwing.

[0051] Compared with the prior art, the present application has the following beneficial technical effects:

[0052] (I) The preparation method of the wear-resistant and wave-transparent drill rod for logging while drilling, by winding the continuous fibers or fiber fabric on the rotating mandrel at a specific angle and tension, the arrangement direction of the fibers is optimized by precisely controlling the winding angle of the fibers, and the pre-tightening tension of the fibers reduces the resin-rich area during winding, so that the composite pipe is reasonably matched in strength and stiffness; in addition, the fibers are continuously wound to form an integral structure, avoiding the weak points caused by interlayer bonding in the lamination process, and further improving the mechanical properties such as tensile and torsional resistance of the composite pipe.

[0053] (II) The drill pipe for logging while drilling with wear resistance and wave penetration of the application can allow electromagnetic wave signals to penetrate the drill pipe by selecting high modulus and low dielectric constant fibers as the main raw material, and can solve the shielding problem of electromagnetic waves by the traditional metal drill pipe, and the good wave penetration of the pipe body improves the detection accuracy.

[0054] (III) The drill pipe for logging while drilling with wear resistance and wave penetration of the application has a wear-resistant insulating coating on the outer wall of the high-strength wave-penetrating composite pipe, and the wear-resistant coating powder is bonded to the base body by high-pressure cold spraying process, thereby improving the service life of the outer pipe of the logging instrument.

[0055] (IV) The drill pipe for logging while drilling with wear resistance and wave penetration of the application considers mechanical strength under the premise of ensuring the wave penetration performance of the drill pipe, and reliably connects the high-strength wave-penetrating composite pipe and the metal connector, so that the wave-penetrating drill pipe has high torque transmission and tensile resistance, and can withstand the torque, pressure and vibration in drilling to fully meet the logging while drilling construction requirements.

[0056] (V) The drill pipe for logging while drilling with wear resistance and wave penetration of the application can be used in directional well and branch well construction, and solves the problem of difficult accurate lowering into the target formation when the logging instrument is pushed again after the drill is pulled out. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 It is a schematic diagram of the overall structure of the drill pipe for logging while drilling with wear resistance and wave penetration (cross-sectional view).

[0058] Figure 2 It is a schematic diagram of the structure of the metal connector (side view).

[0059] Figure 3 It is a front view of the metal connector.

[0060] The meanings of the various reference numbers in the figure are as follows: 1 - high-strength wave-penetrating composite pipe, 2 - metal connector, 3 - wear-resistant insulating coating, 4 - load transmission rivet, 5 - logging instrument for logging while drilling.

[0061] 201 - metal connector body, 202 - metal connector tool installation cavity, 203 - logging instrument setting cavity, 204 - high-strength wave-penetrating composite pipe connecting cavity, 205 - metal connector internal thread, 206 - logging instrument fixing thread, 207 - rivet positioning hole.

[0062] The technical solutions of the application are further described below in conjunction with the embodiments. DETAILED DESCRIPTION

[0063] It should be noted that all the materials and instruments used in the present application, in the absence of special instructions, are known materials and instruments in the art. For example: PBO fiber refers to poly-p-phenylene benzobisoxazole fiber. The logging-while-drilling instrument 5 uses conventional logging-while-drilling instruments known in the prior art.

[0064] In accordance with the above technical solution, the following specific embodiments of the present application are given. It should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation based on the technical solution of the present application falls within the scope of protection of the present application.

[0065] Example 1:

[0066] The present embodiment gives a preparation method of a wear-resistant and wave-transparent drill pipe for logging while drilling, which specifically comprises the following steps:

[0067] Step one, preparation of high-strength wave-transparent composite pipe:

[0068] Step 1.1, preparation of high-strength wave-transparent pipe:

[0069] Step 1.1.1, preparation of high-strength wave-transparent pipe by fiber winding-laying process:

[0070] Select high-modulus glass fiber roving without twist, with a diameter of 8 μm; install the glass fiber tube yarn on the rotating movable support, and draw a group of glass fiber filaments from the glass fiber tube yarn, which successively passes through the tension three-roller, polyurethane resin tank and glue extrusion roller under the traction of the traction equipment, and is wound and laid along the core mold at 45° and 10°, to obtain a glass fiber pipe with a single layer thickness of 0.2 mm, a cumulative thickness of 12 mm and a length of 1 m.

[0071] Step 1.2, curing and forming:

[0072] Heat the glass fiber pipe prepared in step 1.1 to 60℃, and make it curing and forming, then knock the glass fiber pipe with rubber hammer, so that the curing and forming glass fiber pipe is separated from the core mold, to obtain a glass fiber composite pipe with a length of 1 m, an outer diameter of 74 mm and an inner diameter of 50 mm.

[0073] Step two, preparation of wear-resistant and insulating coating:

[0074] Step 2.1, preparation of wear-resistant and insulating coating by high-pressure cold spraying process:

[0075] The silicon carbide particles are mechanically ball milled in a ball mill at a rotating speed of 200 rpm for 3 h to obtain nano silicon carbide powder; nitrogen gas with a pressure of 0.5 MPa is simultaneously introduced into a solid particle fluidized conveyor and an atomizer of a spray deposition device to atomize and deposit the nano silicon carbide powder on the outer surface of a circumferentially rotating glass fiber composite pipe, the rotating speed of the glass fiber composite pipe is 2 mm / s, and a glass fiber composite pipe with a silicon carbide wear-resistant and insulating coating on the surface is prepared, and the thickness of the silicon carbide wear-resistant and insulating coating is 1 mm.

[0076] Step three, installing the metal connector:

[0077] A pre-tightening force of no less than 30,000 N is applied, and the metal connector 2 is installed on the axial two ends of the glass fiber composite pipe with the silicon oxide wear-resistant and insulating coating on the surface prepared in step two, the metal connector 2 is made of 42CrMo steel, and after the installation is completed, a wear-resistant and wave-transparent drill pipe for logging while drilling is prepared, the outer diameter of the drill pipe is 76 mm, and the wall thickness is 13 mm.

[0078] As a specific scheme of the embodiment, step three specifically includes the following steps:

[0079] Step 3.1, processing the metal connector: one end is processed with a groove for connecting with the high-strength wave-transparent composite pipe; the other end is processed with a female thread for connecting with the thread of other drill pipes; wherein the inner through hole of the connector is not less than the high-strength wave-transparent composite pipe, and the outer diameter is consistent with the body of the high-strength wave-transparent composite pipe.

[0080] Step 3.2, pretreatment before connection: four circular holes are processed on the high-strength wave-transparent composite pipe at a certain distance along the circumference at both ends, and four circular holes are processed along the circumference at the groove end of the metal connector 2, so that the four circular holes can be overlapped after the high-strength wave-transparent composite pipe is matched with the metal connector 2.

[0081] Step 3.3, uniformly applying a layer of structural adhesive on the two ends and the inner and outer surfaces of the high-strength wave-transparent composite pipe, and then connecting a pair of metal connectors 2 respectively, and then fixing and connecting after the rivets are positioned by penetrating into the circular holes.

[0082] Embodiment 2:

[0083] The embodiment provides a preparation method of a wear-resistant and wave-transparent drill pipe for logging while drilling, and the method specifically includes the following steps:

[0084] Step one, preparing a high-strength wave-transparent composite pipe:

[0085] Step 1.1, preparing a high-strength wave-transparent pipe fitting:

[0086] Step 1.1.2, preparing a high-strength wave-transparent pipe fitting by using a fiber weaving-winding process:

[0087] Step 1.1, preparing a high-strength wave-transparent pipe fitting:

[0088] Select low dielectric constant quartz fiber roving, diameter is 12 μm; adopt three-dimensional five-directional weaving structure to weave and form twill quartz fiber cloth, pipe forming after epoxy resin curing; the woven twill quartz fiber cloth is wound on the core mold, and a quartz fiber pipe fitting with a single layer thickness of 0.3 mm, a cumulative thickness of 14.5 mm, a length of 1.5 m and a diameter of 60 mm is prepared.

[0089] Step 1.2, curing and forming:

[0090] The prepared quartz fiber pipe fitting is heated to 80℃, and then the quartz fiber pipe fitting is knocked with a rubber hammer to separate the cured and formed quartz fiber pipe fitting from the core mold, thereby obtaining a quartz fiber composite pipe with a length of 1.5 m, an outer diameter of 89 mm and an inner diameter of 60 mm.

[0091] Step two, preparing wear-resistant insulation coating:

[0092] Step 2.2, preparing wear-resistant insulation coating by winding and coating process:

[0093] The diamond micro-powder particles are uniformly dispersed in the epoxy resin tank, and the outer layer quartz fiber roving is wound on the surface of the quartz fiber composite pipe under the traction of the traction equipment, thereby obtaining a quartz fiber composite pipe with a diamond wear-resistant insulation coating on the surface, and the thickness of the diamond wear-resistant insulation coating is 0.5 mm.

[0094] Step three, installing metal connecting head:

[0095] A pre-tightening force of not less than 30000 N is applied, and a metal connecting head 2 is installed on the axial ends of the quartz fiber composite pipe with the diamond wear-resistant insulation coating prepared in step two, the metal connecting head 2 is made of 40Cr steel, and after installation, a wear-resistant and wave-transparent drill pipe for logging while drilling is prepared, the outer diameter of the drill pipe is 90 mm, and the wall thickness is 15 mm.

[0096] Example 3:

[0097] The embodiment provides a preparation method of a wear-resistant and wave-transparent drill pipe for logging while drilling, and the method specifically comprises the following steps:

[0098] Step one, preparing high-strength wave-transparent composite pipe:

[0099] Step 1.1, preparing high-strength wave-transparent pipe fitting:

[0100] Step 1.1.3, preparing high-strength wave-transparent pipe fitting by twice fiber weaving-winding process:

[0101] PBO fiber roving is selected; a three-dimensional six-directional braiding structure is used to weave PBO fiber cloth, which is then wound into tubes and cured with epoxy resin to form PBO fiber cloth bobbins; the PBO fiber cloth bobbins are installed on a rotating movable support, and a set of PBO fiber filaments are drawn out from the PBO fiber cloth bobbins and passed through a tension three-roller, an epoxy resin tank and an extrusion roller in sequence under the traction of the traction equipment; then a two-dimensional twill weave structure is used to wind the core mold at a 75° winding angle on a core mold with a length of 2m and a diameter of 61mm to obtain PBO fiber tubes.

[0102] Step 1.2, Curing and shaping:

[0103] The PBO fiber tube was heated to 100℃ to solidify and form a shape. Then, the PBO fiber tube was tapped to separate the solidified PBO fiber tube from the mandrel, resulting in a PBO fiber composite tube with a length of 2m, an outer diameter of 89mm, and an inner diameter of 61mm.

[0104] Step 2, prepare the wear-resistant insulating coating:

[0105] Step 2.2: Prepare the wear-resistant insulating coating using a winding and wrapping process.

[0106] The epoxy resin in the glue tank is replaced with polytetrafluoroethylene (PTFE). The outer layer of PBO fiber roving is wound onto the surface of the PBO fiber composite tube under the traction of the traction equipment, passing through the tension three rollers, the PTFE glue tank and the extrusion roller in sequence. This produces a PBO fiber composite tube with a PTFE wear-resistant and insulating coating on the surface. The thickness of the PTFE wear-resistant and insulating coating is 1 mm.

[0107] Step 3, install the metal connector:

[0108] Apply a preload of not less than 20,000 N and install metal connectors 2 at both ends of the PBO fiber composite tube with a polytetrafluoroethylene wear-resistant insulating coating on its surface, which was obtained in step two. The metal connectors 2 are made of 42CrMo steel. After installation, a wear-resistant wave-transmitting drill pipe for logging while drilling is obtained. The outer diameter of the drill pipe is 91 mm and the wall thickness is 15 mm.

[0109] Example 4:

[0110] This embodiment provides a wear-resistant, wave-transmitting drill pipe for logging while drilling, which is prepared using the methods described in Examples 1 to 3; such as Figure 1 As shown, the drill pipe includes a high-strength wave-transparent composite tube 1; both ends of the high-strength wave-transparent composite tube 1 are open in the axial direction, and a metal connector 2 is fixedly installed at each end of the high-strength wave-transparent composite tube 1 in the axial direction; the inner cavity of the high-strength wave-transparent composite tube 1 is used to install logging-while-drilling instruments 5; and the outer surface of the high-strength wave-transparent composite tube 1 is coated with a wear-resistant insulating coating 3.

[0111] As a specific solution of the embodiment, the high-strength wave-transparent composite pipe 1 is made of high-strength wave-transparent fiber and resin; the high-strength wave-transparent material is glass fiber, quartz fiber or PBO fiber, and the resin is polyurethane resin or epoxy resin. In the embodiment, the selected high-strength wave-transparent material has the characteristics of low dielectric constant, light weight and high strength, and the resin matched with the high-strength wave-transparent material has the characteristics of low dielectric constant and flame retardance.

[0112] As a specific solution of the embodiment, the metal connector 2 is made of 42CrMo steel or 42Cr steel, which significantly improves the reliability and service life of the metal connector 2.

[0113] As a specific solution of the embodiment, the wear-resistant insulating coating 3 is made of silicon carbide, diamond or polytetrafluoroethylene; the thickness of the wear-resistant insulating coating 3 is 0.5-1 mm, which improves the wear resistance and service life of the drill pipe without affecting the wave-transparent performance.

[0114] As a specific solution of the embodiment, the wear-resistant wave-transparent drill pipe for logging while drilling has an outer diameter of 76-91 mm and a wall thickness of 13-15 mm, which can adapt to various working conditions of logging while drilling.

[0115] As a specific solution of the embodiment, as shown in Figure 2 and Figure 3 , the metal connector 2 comprises a metal connector body 201, and the cavity in the metal connector body 201 comprises a metal connector drill tool installation cavity 202, a logging instrument setting cavity 203 and a high-strength wave-transparent composite pipe connection cavity 204 in sequence; the inner wall of the metal connector drill tool installation cavity 202 is provided with a metal connector internal thread 205, which is used for connecting the drill pipe with other drill tools; the inner wall of the logging instrument setting cavity 203 is provided with a logging instrument fixing thread 206, which ensures the stable installation of the logging instrument.

[0116] As a specific solution of the embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the metal connector body 201 outside the high-strength wave-transparent composite pipe connection cavity 204 is provided with a plurality of rivet positioning holes 207, which are uniformly arranged along the circumferential direction, and the rivet positioning holes 207 are used for installing the load transmission rivet 4. In the embodiment, the metal connector 2 and the high-strength wave-transparent composite pipe 1 are fixedly connected through the load transmission rivet 4, which ensures the connection reliability of the metal connector 2 and the high-strength wave-transparent composite pipe 1.

Claims

1. A method for preparing a wear-resistant, wave-transparent drill pipe for use in logging while drilling, characterized in that, The wear-resistant and wave-transparent drill pipe for logging while drilling comprises a high-strength wave-transparent composite pipe (1); the axial two ends of the high-strength wave-transparent composite pipe (1) are open, and one metal connector (2) is fixedly installed at each axial end of the high-strength wave-transparent composite pipe (1); the inner cavity of the high-strength wave-transparent composite pipe (1) is used for arranging a logging while drilling instrument; and the outer surface of the high-strength wave-transparent composite pipe (1) is coated with a wear-resistant and insulating coating (3). The method specifically comprises the following steps: Step one, preparing a high-strength wave-transparent composite pipe: Step 1.1, preparing a high-strength wave-transparent pipe by using a fiber weaving-winding process; or preparing a high-strength wave-transparent pipe by using a twice fiber weaving-winding process; The step 1.1 comprises: Step 1.1.2, preparing a high-strength wave-transparent pipe by using a fiber weaving-winding process: The high-strength wave-transparent fiber is woven into a twill high-strength wave-transparent fiber cloth by using a three-dimensional five-directional weaving structure, the woven twill high-strength wave-transparent fiber cloth is wound on a core mold, and the pipe is formed after winding; then, the pipe is cured by using resin to obtain the high-strength wave-transparent pipe; Step 1.1.3, preparing a high-strength wave-transparent pipe by using a twice fiber weaving-winding process: The high-strength wave-transparent fiber is woven into a high-strength wave-transparent fiber cloth by using a three-dimensional six-directional weaving structure, the pipe is formed after winding; then, the pipe is cured by using resin to form a high-strength wave-transparent fiber cloth tube yarn; the high-strength wave-transparent fiber cloth tube yarn is installed on a rotating movable support, a group of high-strength wave-transparent fiber filaments are drawn from the high-strength wave-transparent fiber cloth tube yarn, and the high-strength wave-transparent fiber filaments pass through a tension three-roller, a groove box filled with resin and an extrusion roller in sequence under the traction of a traction device; then, the high-strength wave-transparent pipe is prepared by winding on the core mold at a certain winding angle by using a two-dimensional twill weaving structure; Step 1.2, curing the high-strength wave-transparent pipe prepared in step 1.1 to form the high-strength wave-transparent composite pipe (1) after demolding; Step two, preparing a wear-resistant and insulating coating on the surface of the high-strength wave-transparent composite pipe to form a high-strength wave-transparent composite pipe: the wear-resistant and insulating coating (3) is prepared by using a high-pressure cold spraying process; or the wear-resistant and insulating coating (3) is prepared by using a winding coating process; or the wear-resistant and insulating coating (3) is prepared by using a normal-pressure coating process; Step three, installing a metal connector: A pre-tightening force is applied, the metal connector (2) is installed at the axial two ends of the high-strength wave-transparent composite pipe (1) with the wear-resistant and insulating coating (3) on the surface, the interface between the composite pipe (1) and the metal connector (2) is coated with structural adhesive, the composite pipe (1) and the metal connector (2) are in interference fit in the radial direction, and the wear-resistant and wave-transparent drill pipe for logging while drilling is obtained after installation.

2. The method of claim 1, wherein the method is characterized by: The step two comprises: Step 2.1, preparing a wear-resistant and insulating coating by using a high-pressure cold spraying process: The nano wear-resistant and insulating coating (3) raw material powder is obtained by ball milling the wear-resistant and insulating coating (3) raw material particles; the gas is simultaneously introduced into the solid particle fluidization conveyor and the atomizer of the spraying and depositing device to atomize and deposit the nano wear-resistant and insulating coating (3) raw material powder on the outer surface of the circumferentially rotating high-strength wave-transparent composite pipe (1) to obtain the high-strength wave-transparent composite pipe (1) with the wear-resistant and insulating coating (3) on the surface; Step 2.2, preparing a wear-resistant and insulating coating by using a winding coating process: The raw material of wear-resistant insulation coating (3) is placed in the groove box, and the fibers on the outer layer of high-strength wave-transparent composite pipe (1) are pulled through the tension three-roller, the groove box filled with the raw material of wear-resistant insulation coating (3) and the extrusion roller in turn under the traction of the traction equipment, so that the raw material of wear-resistant insulation coating (3) is wound on the surface of high-strength wave-transparent composite pipe (1), and high-strength wave-transparent composite pipe (1) with wear-resistant insulation coating (3) on the surface is prepared. Step 2.3, wear-resistant insulation coating is prepared by using normal pressure coating process: The particles of wear-resistant insulation coating (3) and the resin are mixed in the groove box, the diluent is added and stirred uniformly, and the mixed glue is uniformly coated on the surface of high-strength wave-transparent composite pipe (1) in a certain direction by using brushing tool, and high-strength wave-transparent composite pipe (1) with wear-resistant insulation coating (3) on the surface is prepared.

3. The method of claim 1, wherein the method further comprises the step of: In step 1.1, the winding angle of high-strength wave-transparent fiber ranges from positive 10° to negative 75°. ​ 4. The method of claim 1, wherein the method is characterized by: In step 1.2, the heating temperature used in the curing process is 60-100℃.

5. The method of claim 2, wherein the method further comprises the step of: In step 2.1, the ball milling condition is that the mechanical ball milling is carried out in the ball mill at a speed of 200-250 rpm for 3-4 h. ​ 6. The method of claim 2, wherein the method further comprises the step of: 5 applying a protective coating to the surface of the drill pipe. In step 2.1, the gas is nitrogen with a pressure of 0.5-1 MPa.

7. The method of claim 2, wherein the method further comprises the step of: In step 2.1, the rotation speed of high-strength wave-transparent composite pipe (1) is 2-4 mm / s. ​ 8. The method of claim 2, wherein the method further comprises the step of: In step three, the pre-tightening force is not less than 30,000 N. ​ 9. A wear resistant, wave transparent drill pipe for use in logging while drilling, characterized in that, The high-strength wave-transparent composite pipe (1) is provided with a wear-resistant insulation coating (3) on the outer surface. The high-strength wave-transparent composite pipe (1) is prepared from high-strength wave-transparent fiber and resin. The high-strength wave-transparent fiber is selected from one or more continuous fiber materials selected from the group consisting of glass fiber, basalt fiber, quartz fiber, ceramic fiber, aramid fiber and poly-p-phenylene benzobisoxazole fiber. The resin is selected from one or more combinations of epoxy resin, cyanate ester resin, phenolic resin, polyurethane resin and acrylic resin. The metal connector (2) is made of alloy steel or non-magnetic steel. The wear-resistant insulation coating (3) is made of one or more materials selected from the group consisting of diamond, aluminum oxide, silicon carbide, polycarbosilane and polytetrafluoroethylene. The wear-resistant wave-transparent drill pipe for logging while drilling is prepared by the method according to any one of claims 1 to 8.

10. The wear resistant, wave transparent drill pipe for use in logging while drilling of claim 9, wherein, The thickness of the wear-resistant insulation coating (3) is 0.5-1 mm. The outer diameter of the wear-resistant wave-transparent drill pipe for logging while drilling is 70-100 mm, and the wall thickness is 12-20 mm.

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